.qr-code-generator {
  max-width: 400px;
  padding: 20px;
  text-align: center;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  box-sizing: border-box;
}

img {
  max-width: 100%;
  height: auto;
  margin-top: 20px;
}